The two tectonic plates slide past eachother
Salt water is a homogeneous mixture or a solution.
Wind erosion is the main cause. And since it is the desert that wind can pick up tiny sand rock particles that slowly grind against the rock. Over time the erosion will give a jagged rock the smooth features as if it had been submerged in a river for the roughly same period of time.
Maybe your title can be Earthquake effects
